package com.gjy.util.captcha;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.HashMap;
import java.util.Map;

/**
 * 二维码生成器
 *
 * @author 宫静雨
 * @version 1.0
 * @since 2023-10-24 09:26:14
 */
public class QRCode {

    // 二维码颜色
    private static final int QRCOLOR = 0xFF000000;
    // 背景色
    private static final int BGCOLOR = 0xFFFFFFFF;
    // 二维码宽度
    private static final int width = 400;
    // 二维码高度
    private static final int height = 400;

    private static Map<EncodeHintType, Object> getDecodeHintType() {
        // 用于设置QR二维码参数
        Map<EncodeHintType, Object> hints = new HashMap<>(16);
        // 设置QR二维码的纠错级别（H为最高级别）具体级别信息
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 设置编码方式
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 设置二维码四周空白部分
        hints.put(EncodeHintType.MARGIN, 2);
        return hints;
    }

    /**
     * 普通二维码
     *
     * @param qrUrl 内容
     */
    public static BufferedImage createCode(String qrUrl) {
        MultiFormatWriter multiFormatWriter;
        BitMatrix bm;
        BufferedImage image = null;
        Map<EncodeHintType, Object> hints = getDecodeHintType();
        try {
            multiFormatWriter = new MultiFormatWriter();
            // 参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数
            bm = multiFormatWriter.encode(qrUrl, BarcodeFormat.QR_CODE, width, height, hints);
            int w = bm.getWidth();
            int h = bm.getHeight();
            image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

            // 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
            for (int x = 0; x < w; x++) {
                for (int y = 0; y < h; y++) {
                    image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGCOLOR);
                }
            }
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return image;
    }

    /**
     * 带有 logo 二维码
     *
     * @param qrUrl    内容
     * @param logoPath logo 路径
     */
    public static BufferedImage createCodeWithLogo(String qrUrl, String logoPath) {
        BufferedImage bim = createCode(qrUrl);
        try {
            // 读取二维码图片，并构建绘图对象
            Graphics2D g = bim.createGraphics();

            // 读取Logo图片
            BufferedImage logo = ImageIO.read(new File(logoPath));
            //设置logo的大小,这里设置为二维码图片的20%,过大会盖掉二维码
            int widthLogo = Math.min(logo.getWidth(null), bim.getWidth() * 3 / 10),
                    heightLogo = logo.getHeight(null) > bim.getHeight() * 3 / 10 ? (bim.getHeight() * 3 / 10) : logo.getWidth(null);

            // logo放在中心
            int x = (bim.getWidth() - widthLogo) / 2;
            int y = (bim.getHeight() - heightLogo) / 2;
            // logo放在右下角
            // int x = (image.getWidth() - widthLogo);
            // int y = (image.getHeight() - heightLogo);

            //开始绘制图片
            g.drawImage(logo, x, y, widthLogo, heightLogo, null);
            g.dispose();
            logo.flush();
            bim.flush();
            return bim;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 带有 logo和文字 的二维码
     *
     * @param qrUrl    内容
     * @param logoPath logo路径
     * @param text     文字
     */
    public static BufferedImage createCodeWithLogoAndText(String qrUrl, String logoPath, String text) {
        BufferedImage image = createCodeWithLogo(qrUrl, logoPath);
        //把文字添加上去，文字不要太长，这里最多支持两行。太长就会自动截取啦
        try {
            if (text != null && !text.equals("")) {
                //新的图片，把带logo的二维码下面加上文字
                BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR);
                Graphics2D outg = outImage.createGraphics();
                //画二维码到新的面板
                assert image != null;
                outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null);
                //画文字到新的面板
                outg.setColor(Color.BLACK);
                outg.setFont(new Font("宋体", Font.BOLD, 30)); //字体、字型、字号
                int strWidth = outg.getFontMetrics().stringWidth(text);
                if (strWidth > 399) {
//                  //长度过长就截取前面部分
//                  outg.drawString(productName, 0, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 5 ); //画文字
                    //长度过长就换行
                    String productName1 = text.substring(0, text.length() / 2);
                    String productName2 = text.substring(text.length() / 2);
                    int strWidth1 = outg.getFontMetrics().stringWidth(productName1);
                    int strWidth2 = outg.getFontMetrics().stringWidth(productName2);
                    outg.drawString(productName1, 200 - strWidth1 / 2, image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12);
                    BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR);
                    Graphics2D outg2 = outImage2.createGraphics();
                    outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null);
                    outg2.setColor(Color.BLACK);
                    outg2.setFont(new Font("宋体", Font.BOLD, 30)); //字体、字型、字号
                    outg2.drawString(productName2, 200 - strWidth2 / 2, outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight()) / 2 + 5);
                    outg2.dispose();
                    outImage2.flush();
                    outImage = outImage2;
                } else {
                    outg.drawString(text, 200 - strWidth / 2, image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12); //画文字
                }
                outg.dispose();
                outImage.flush();
                image = outImage;
                image.flush();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return image;
    }

}
